Troubleshooting - Graco RoadLazer RoadPak Repair Manual

Troubleshooting

Troubleshooting
Paint Guns and Bead Guns
PROBLEM
Paint guns not spraying
32
CAUSE
Clogged tips
Fuse (20A) is blown
Gun arm interlock switch
Air compressor and unloader valve 1. Turn toggle switch at top of unloader (148)
Paint gun actuation airline
Solenoid valves
Programmable Skipline Controller
Before you proceed with Troubleshooting, perform Pres-
sure Relief Procedure, page 8.
Check everything in the troubleshooting tables before you
disassemble any equipment.
Clean tips
Check 20A fuse between engine and solenoid
air valve connector.
Check to make sure connectors on gun arm
interlock switch are properly attached. When
gun arm is in down position, measure 12V
across the switch terminals to ensure it is work-
ing properly. Replace switch if necessary.
to horizontal. NOTE: Unloader bypasses air
when system pressure reaches approxi-
mately 115-120 psi (8 bar).
2. Turn off bead tank air valve (184) to isolate
system.
3. If no leaks, check paint gun actuation air
lines.
1. Remove actuation air lines from paint gun.
2. Trigger skipline controller.
3. If air flows from airline, repair paint gun
(manual 308613). If air does not flow, check
solenoid valves.
1. Go to diagnostic screen and check to see if
all solenoids are being recognized by Road-
Pak Skipline Controller (manual 3A5387).
2. Remove solenoid valve cover (19).
3. Check for broken wiring or a damaged plug
(see Wiring Diagram, page 39).
4. Check for 12V DC between red wire and
ground.
1. Go to diagnostic screen and make sure all
switches are properly working (manual
3A5387).
2. Inspect wiring and plugs for damage.
3. Replace any damaged wiring or plugs (man-
ual 3A5387).
SOLUTION
3A5385A